The first person that automates tracing buildings from yahoo images on Aruba will be slapped by me!
Besides regulare displacement, the entire imagery is off by 10~100m , way to clouded and low res. So please, please, please do not start some global bot that will place buildings all over.. 2010/12/28 Frederik Ramm <[email protected]>: > Hi, > > [email protected] wrote: >> >> This is a major issue when tracing tower blocks - the taller the building >> the more the roof appears to be displaced relative to the floor due to the >> perspective of the plane taking the photos. I have always tried to map the >> base because, ultimately, a map is a representation of what's at >> ground-level. If you mapped roofs you'd get very tall buildings overlapping >> the surrounding roads. > > Sometimes I map the roof to get a good idea of the shape, then move the > result to match the base. > > It would be interesting to have editor support for estimating the building > height depending on that displacement, or depending on the extent of the > shadow - that would have to be calibrated for each imagery and location of > course but so does the displacement of the whole image, and we're seeing > people working on the latter... > > Bye > Frederik > > -- > Frederik Ramm ## eMail [email protected] ## N49°00'09" E008°23'33" > > _______________________________________________ > talk mailing list > [email protected] > http://lists.openstreetmap.org/listinfo/talk > _______________________________________________ talk mailing list [email protected] http://lists.openstreetmap.org/listinfo/talk
